From 2066e2797d81210d239f6effd4615db5d0f1f115 Mon Sep 17 00:00:00 2001
From: daan <daanl@outlook.com>
Date: Mon, 19 Aug 2019 19:29:27 -0700
Subject: [PATCH] don't allow allocations larger than PTRDIFF_MAX, issue #121

---
 src/page.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/page.c b/src/page.c
index 627cb728..41e41b89 100644
--- a/src/page.c
+++ b/src/page.c
@@ -741,7 +741,7 @@ void* _mi_malloc_generic(mi_heap_t* heap, size_t size) mi_attr_noexcept
   // huge allocation?
   mi_page_t* page;
   if (mi_unlikely(size > MI_LARGE_OBJ_SIZE_MAX)) {
-    if (mi_unlikely(size >= (SIZE_MAX - MI_MAX_ALIGN_SIZE))) {
+    if (mi_unlikely(size > PTRDIFF_MAX)) {  // we don't allocate more than PTRDIFF_MAX (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
       page = NULL;
     }
     else {